Sleep Republic vs Sleeping Duck
One is built around 1,850 pocket springs and a spinal-health endorsement. The other lets each side of the bed have its own firmness. They score 8.9 and 8.8 — and the right answer has almost nothing to do with that.
You want the strongest support and edge scores we have recorded in this price bracket, the longest trial of the two, and you already know roughly what firmness suits you.
You and your partner disagree about firmness, or you genuinely do not know what suits you and want to change it after delivery rather than guess before it.
These two are not really competing
They land within a tenth of a point of each other, which makes the scores almost useless for choosing between them. The question that decides it is whether you need to change the firmness after the mattress arrives.
Sleeping Duck is built entirely around that. You pick medium, firm, or half-and-half — a different firmness on each side — and if you get it wrong the company posts you replacement foam pads. Our review scores it 9.8 for customisation — the top of our scale — and no other mattress we cover has a score on that axis at all, because no other mattress does it.
Sleep Republic does not do this at all. Our own review lists “anyone wanting adjustable firmness” under the reasons to skip it. It is one mattress, medium-firm, and it is very good at being that: 1,850 pocket springs across five zones, an Australian Spinal Research Foundation endorsement, and the highest support and edge-support scores of the two.
So if adjustability is why you are reading this, Sleep Republic cannot replace Sleeping Duck and no amount of spring count changes that. If it is not, the rest of this page matters.
The specifications
| Sleep Republic | Sleeping Duck | |
|---|---|---|
| Our score | 8.9 | 8.8 |
| Queen RRP | $1,660 RRP · checked 1 September 2026 | $1,649 · checked 2 September 2026 |
| What you actually pay | Almost always discounted — around $1,245 at the time of writing | Rarely discounted; RRP is the price |
| Trial | 150 nights | 100 nights |
| Warranty | 12 years | 10 years |
| Firmness | Medium-firm, fixed | Adjustable — medium, firm, or split |
| Springs | 1,850 pocket springs, 5 zones | Pocket springs, reinforced perimeter |
| Comfort layer | Natural latex, cashmere cover | Swappable foam pads, bamboo cover |
| Cover | Cashmere blend | Removable and washable |
| Credentials | Spinal Research Foundation endorsed; Bedbuyer #1 mattress-in-a-box three years running | CHOICE recommended three years running |
| Where it is made | Designed in Melbourne, manufactured in China | Melbourne company; foam made in Australia |
Where each one actually wins
Five sub-scores are common to both reviews. Sleep Republic takes three, Sleeping Duck takes two, and the two each brand does not share — motion isolation and customisation — are not comparable, so they are left out rather than fudged into a total.
The gaps that matter are value and support. Sleeping Duck’s 7.8 for value is not a criticism of the mattress — it is what happens on the price you actually pay. At list price these two are eleven dollars apart. Sleep Republic is discounted almost permanently and Sleeping Duck very rarely is, so in practice the gap runs to roughly $400 — and that is the number our value scores reflect. You are paying for the adjustment, and it is worth it exactly as often as you use it.
Two people, two firmnesses, one mattress. Nothing else we review solves that without buying two singles and zipping them together. If one of you sleeps on your side and the other on their stomach, this is the product built for your bed, and the 9.8 customisation score is us saying so.
An Australian Spinal Research Foundation endorsement, 1,850 individually wrapped springs across five zones, and 150 nights to decide instead of 100. If the reason you are shopping is a back that hurts rather than a partner who disagrees, that is the more relevant set of credentials.
The honest problems
No adjustability whatsoever — if the firmness is wrong for you, your only option is the return. Cooling is its weakest axis at 8.2, which is worth weighing in a Queensland summer. It is designed in Melbourne but manufactured in China, and the brand states that openly rather than hiding behind “Australian owned”. And if you want a plush surface rather than a supportive one, the standard model is the wrong Sleep Republic — the LUXE exists for that.
It is the more expensive mattress in practice — the list prices are eleven dollars apart, but Sleep Republic is discounted almost permanently and this is not — with a shorter trial (100 nights against 150) and a shorter warranty (10 years against 12). Its value score of 7.8 is among the lowest we have given. And the adjustment system only earns its premium if you actually use it — plenty of owners set it once and never touch it again, and those buyers paid for a feature they did not need.